KR200271656Y1 - Apparatus for reforming a pipe - Google Patents

Abstract

The present invention relates to a pipe straightener, wherein a straightening means comprising a plurality of pairs of straightening rollers having an elongated surface inside a hollow rotary body 23 in which a tubular shaft portion is rotatably installed in a support 22 of a frame. And adjusting means for adjusting the spacing of the opposing calibration rollers and for adjusting the stagger angle with respect to each other so as to calibrate the straightness and roundness as the pipe passes between the calibration rollers. A first pair of rollers 30, 31, 30 ', 31' having subsequent S-shaped contours and subsequently arranged so as to relieve stress by continuously applying the pipe to the local bending strain continuously and repeatedly. And a second pair of concave rollers 32 so as to remove stress due to curvature deformation caused by the first pair of rollers. The process of the curved deformation is continuously received at the same time as the rotation of the pipe, so that the pipe is destressed by the continuous deformation together with the friction between the first roller pair, and the stress generated during the deformation process is also arranged in the second roller. Even if the surface is removed by a pair and undergoes subsequent surface polishing, there is an advantage that deformation due to thermal stress does not occur.

Description

Pipe Straighteners {APPARATUS FOR REFORMING A PIPE}

The present invention relates to a pipe straightener, in particular, which is employed at the end of a pipe sculpter for forming a stainless steel pipe, by applying a local bending strain repeatedly and continuously to the pipe together with frictional heat to remove the stresses generated when the pipe is lengthened. It relates to a pipe straightener that removes residual stresses so that pipe deformation does not occur after calibration.

An example of such a pipe straightener is disclosed in Korean Patent Application No. 1995-10502 (1995.04.29), and the pipe straightener of the above application is employed in the tube 1 as shown in FIG. The tuber 1 is a hot coil, for example, stainless steel plate (2) is rounded in the form of a pipe, then welded with a welder (6) to form a pipe, remove the weld bead, and then cut to a constant length in the cutter (3) Finally, the pipe surface is smoothly processed in the grinder 4 to form a pipe. During the pipe straightener 5, the pipe is locally deformed and bent as it is heated while being subjected to the pipe joint and welding process. It is provided between the cutter 3 and the polishing machine 4.

The pipe straightener 5 for the pipe manifold has three pairs of rollers in which the same rollers 7 and 7 'having a concave curved surface in the middle are arranged alternately as shown in FIG. 2. Vertical pillars 10 are spaced apart from each other and disposed inside the hollow rotating frame 8, and protruding at both ends of the rotating frame 8 and communicating with the interior of the rotating frame 9. It is rotatably supported by a pulley 11 is provided on one side of the shaft portion 9 is configured to rotate the rotating frame by a drive means not shown in the figure.

Correction of pipe bending and crushing in such a straightener (5) is such that the curved surfaces of the three pairs of rollers in which the pipe to be corrected through the shaft (9) are staggered in two mutually arranged rotations of the rotating frame This is done by wrapping and rotating the outer circumferential surface of the pipe disposed between the surfaces.

However, the straightener 5 as described above has a high accuracy rate as the rollers of the curved surface are rotated while rubbing the pipe outer circumferential surface without being in close contact with the pipe outer circumferential surface, so that the accuracy of the straight and the roundness of the pipe being corrected is low. In the case of a pipe made of a soft material such as a pipe, there is a problem of roughening the pipe surface.

In addition, the guide rollers are arranged at the front and rear sides of the calibrator, but when the long and curved pipe is rotated by the rollers rotating together with the calibrator, the far end of the pipe is rotated to a larger radius of rotation so that the pipe is damaged or surrounded. There was a problem that jeopardized the safety of workers.

In order to improve the straightness of the pipe in the pipe straightness straightener of the prior art, in Korea Utility Model Registration No. 0187051, as shown in FIG. 12) has been proposed to install additionally.

However, the use of the secondary straightener 12 in order to compensate for the straightness of the pipe by the straightener 5 of the tuber as disclosed in Korean Patent Application No. 1995-10502 (1995.04.29), the overall tuber equipment becomes complicated and wide. There is a problem that the area is required and causes an increase in the cost of the tube.

Nevertheless, the conventional pipe straightener as described above is limited to being installed and used in a pipe manifold for forming a pipe. For example, there is a disadvantage in that a straight pipe can not be used to reuse a curved pipe used in a plastic house.

In addition, Utility Model Registration No. 255240 includes a cylindrical lower side calibration roller and a calibration roller having a concave outer circumferential surface concave in the form of an improvement, and more precisely configures the gap and stagger angle of the opposing calibration rollers. Since the roundness and straightness can be precisely corrected and thermal stress is removed by the frictional heat generated at that time, the problem that the welded part of the pipe is broken during the roundness and straightness correction in the conventional straightener is eliminated to reduce the defective rate. .

However, despite the removal of thermal stress by the frictional heat of the prior art, the straightness is maintained when passing through the straightening rollers, but subsequently after the cooling by the thermal stress in the surface polishing process by the essential abrasive stone, the calibrated pipe is returned again. The problem of curvature remained.

The object of the present invention is to solve the problems of the conventional pipe straighteners, while the pipe is rotated as it passes through the straightening rollers while the local micro deformation is repeatedly and continuously generated in the longitudinal direction of the pipe while rotating the pipe remaining It is to provide a pipe straightener with an improved structure that completely eliminates the stress to ensure that the pipe is not deformed even after the calibration and surface polishing process and the corrected straightness is maintained.

Another object of the present invention is not only to be used to correct the bending state of the pipe to be formed by installing the rear side of the welder in the tube, but also the roundness and straightness of the pipe to recycle the bent pipe used for scaffolding of the plastic house or construction site It is to provide a pipe straightener that may be used alone for the purpose of the calibration.

1 is a block diagram showing a schematic configuration of a conventional pipe manifold.

Figure 2 is a side view showing a schematic configuration of a conventional pipe straightener employed in FIG.

Figure 3 is a schematic view showing a schematic configuration of another conventional tube machine.

4 is a schematic longitudinal sectional view of a pipe straightener according to the present invention;

5 is a partial side cross-sectional view showing the relative position of the roller pairs of FIG.

6 is a schematic cross-sectional view showing the structure of the support of the pipe inlet.

7 is a sectional view showing a schematic structure of a roller adjusting device.

8 and 9 are cross-sectional views respectively showing the upper and lower rollers of the first roller pair according to the present invention.

10 and 11 are cross-sectional views showing the contour of the upper and lower rollers of the first roller pair of another embodiment according to the present invention.

12 is a cross-sectional view showing the contour of the second roller pair according to the present invention.

Explanation of symbols on the main parts of the drawings

20: straightener 23: rotating body

29: bracket 30,31,32: roller

In order to achieve the above object, the pipe straightener according to the present invention includes a first and a second pair of straightening rollers mounted opposite to the inside of the hollow rotating body rotatably installed in the frame, the first straightening roller pair is For straightness straightening, it has curved surfaces in S-shape to correspond to each other continuously and repeatedly to apply local deformation repeatedly to the pipe moving forward to remove the strain stress, and the second straightening roller phase is for straightening pipe straightness and roundness. It is characterized in that it has a concave surface in the shape of an oblong for.

Hereinafter, with reference to the accompanying drawings to describe the present invention in more detail.

4 and 5, the pipe straightener 20 of the present invention is a cylindrical hollow rotor in which a hollow shaft is rotatably mounted by a bearing in both struts 22 fixed to the frame 21. (23) and an adjusting device for supporting a bracket 29 provided at positions opposite to the outer circumferential surface of the rotating body in the inner space of the rotating body to mount the pair of straightening rollers described below, and adjusting the relative horizontal and vertical positions thereof ( 24, 25) (26, 27) pairs are provided, and the brackets 29 are equipped with first and second pairs of calibration rollers 30, 31, 32, 33, respectively. The rotating body 23 is rotated by the pulley 52 connected to the belt 51 by the motor 50 mounted to the frame.

As shown in FIG. 6, the adjusting device includes a handle having a hollow member 34 having a screw formed on an inner side thereof and a shaft portion 35 screwed to a screw portion of the inner side thereof. 34) the spacing of each pair of calibration rollers can be adjusted. In addition, the adjusting device is equipped with a worm gear 38 is mounted to the outside of the hollow member 34 of the upper bracket and to rotate the worm in engagement with the worm. The shaft 39 of the worm gear 38 is supported by a bearing provided on the rotating body, and rotates the shaft 39 with a spanner at the free end projecting outward, thereby eventually adjusting the horizontal rotational position of the worm gear and the hollow member, that is, the bracket. I can adjust it. By means of such adjustment devices, the diameter of the pipes to correct the roundness and straightness can be adjusted arbitrarily according to the diameter of the pipes to correct the gap between each pair of opposed calibration rollers and the staggered position with respect to each other. It can be precisely adjusted accordingly.

In Figure 7 is fixed to the support 41 is mounted with a support roller 40 for transporting the pipe to be corrected to the pipe straightening device of the present invention, the support roller 40 is positioned up and down according to the size of the pipe diameter A long hole 43 is formed in the outer support plate 42 of the support so that the support roller 40 is rotatably supported at the shaft portion 45 fixed to the inner support plate 44, and fixed to the inner support plate. The end of the shaft portion projecting outward is penetrated through the long hole 43 of the outer support plate 42 and fixed with a nut.

FIG. 8 shows the contour of the roller 31 in the first roller pair 30 and 31 for straightening the pipe according to the present invention, and FIG. 9 shows the contour of the roller 31. The rollers 30, 31 shown in FIGS. 8 and 9 are for pipe straightening with pipe diameters from 50.8 to 128 mm. The left part of the roller 30 of FIG. 8 is concavely formed by the curved surface of 1270 mm radius, and the right part is convexly formed by the curved surface of 780 mm radius. On the other hand, the roller 31 shown in FIG. 9 is formed in a concave shape on the left side of a curved surface having a radius of 1270 mm, and on its right side is formed in a concave surface of a radius of 780 mm. The pipe to be calibrated is first drawn through the right side of the rollers 30 and 31 to be curved concave and continuously rotated, and at the left side of the roller, the concave portion again becomes convex and eventually becomes straight. Similarly, the concave deformation of the pipe and the deformation of the local part of the pipe where the concave portion becomes flat are continuously performed at the same time as the rotation of the pipe, so that the pipe is stressed out by the continuous deformation together with the friction between the upper and lower rollers. The subsequent surface polishing process does not cause deformation due to thermal stress.

10 and 11 show a first roller pair 30 ', 31' of another embodiment, and the first roller pair of this embodiment shows the contour shape of the pipe straightening rollers having a pipe diameter of 50.8 mm or less. Is showing. The roller 30 'in the present embodiment has a concave portion at the center of the concave curved surface having a radius of 1270 mm and is further concave 0.8 mm and protrudes 0.8 mm on both sides thereof, the convex portion, the concave portion, The convex part is formed again, and the roller 31 ′ disposed below the concave surface of the roller 30 ′ has a shape opposite to that of the roller 30 ′, that is, a concave curved surface having a radius of 1270 mm as a whole. On both sides, the pipes, each having a low profile of 0.8 mm, rotate and move from right to left on the pair of rollers, which are convexly curved and then concave again through the center and then convex again when discharged. In the above embodiment, the pipe is subjected to more strain stress and the heat stress received from the pipe work is removed and bent A becomes deformed pipe is a pay-off action to avoid damage when the correction.

12 shows a concave contour of the second pair of rollers 32 of the present invention, the pipes of which the upper and lower rollers have the same shape, and the pipes passing between them rotate in a compressed state between the upper and lower rollers 32. While passing through the first roller pair serves to remove the stress in the pipe repeatedly undergoing microdeformation.

In addition, it is easy to damage the pipe surface as the surfaces of the straightening rollers are in close contact with the outer circumferential surface of the pipes. In particular, it is preferable to manufacture the straightening rollers with SKD 11 to prevent damage to the surface of the pipes made of soft material such as copper. Do.

The calibrator of the present invention can not only be used in the rear side of the cutter for straightness and roundness correction of the pipe formed in the pipe tube of FIG. 1, but also recycles the bent pipe used in the plastic house or the scaffolding pipe used in the construction site. It may be used alone to correct roundness and straightness.

According to the present invention, the concave portion is re-convex again in the left part of the roller and is continuously straight while being drawn through the right side of the first pair of rollers 30 and 31 to be concave and curved. In this way, the concave deformation of the pipe and the deformation of the local portion of the pipe where the concave portion becomes flat are continuously deformed at the same time as the rotation of the pipe. The stress is removed by the continuous deformation together with the friction between the roller pairs, and the stresses generated during this deformation process are also removed by the second arranged roller pair so that deformation due to thermal stress occurs even after the subsequent surface polishing process. Will not be.

Claims (3)

In the support 22 of the frame, there is provided a calibration means composed of a plurality of pairs of calibration rollers whose surface is long and long inside the hollow rotor 23 in which the tubular shaft portion is rotatably installed, and the gap between the opposing calibration rollers. In the pipe straightener for adjusting the straightness and roundness as the pipe is passed between the straightening rollers by adjusting the angle and the angle of staggering with respect to each other, the straightening means is locally curved deformation of the incoming pipe The first pair of rollers 30, 31, 30 ′, 31 ′ with S-shaped contours corresponding to each other so as to relieve stress by repeatedly applying a plurality of rollers at the same time as the rotation is repeated, and then disposed thereafter. Pipe straightener, characterized in that it consists of a second pair of concave rollers (32) to eliminate stress due to curvature deformation caused by the field. According to claim 1, wherein the first pair of rollers (30, 31) of the roller 30 as a whole, the left side is formed concave with a curved surface having a radius of 1270mm, the right side is formed with a curved surface of a radius of 780 mm On the other hand, the lower roller (31) is a pipe straightener, characterized in that the left side is concave formed with a curved surface of radius 1270mm, while the right side has a contour formed concave with a curved surface of radius 780 mm. 2. The roller (30 ') of the first roller pair (30', 31 ') as a whole has a concave curved surface having a radius of 1270 mm, and the center portion is further concave 0.8 mm, and both sides are 0.8 mm. It protrudes and consists of a convex part on one roller curved surface, a concave portion and a convex portion, and the roller 31 'disposed below is opposite to the curved surface of the roller 30', that is, a radius of 1270 as a whole. A pipe straightener comprising a concave curved surface of mm but having a central portion of 0.8 mm convex, and having a contour of 0.8 mm lower on each side.